Spring arrangement for spring drive unit and spring drive unit comprising spring arrangement

Abstract

The invention describes a spring arrangement for spring drive unit, which spring arrangement comprises a spring, a pullrod connected at a first pullrod end to a first spring end of the spring and connected at an opposite second pullrod end to a rotary shaft of the spring drive unit, a frame plate against which a second spring end of the spring is mounted and the frame plate being provided with an opening through which the pullrod extends to be connected to the shaft. Further, the first spring end of the spring, to which the pullrod is connected, is unguided, and the parameters of the spring are chosen in response to the operating conditions of the spring drive unit such that the spring is stable during operation.

1. Spring arrangement for spring drive unit, which spring arrangement comprises a spring, a pullrod connected at a first pullrod end to a first spring end of the spring and connected at an opposite second pullrod end to a rotary shaft of the spring drive unit, a frame plate against which a second spring end of the spring is mounted and the frame plate being provided with an opening through which the pullrod extends to be connected to the shaft, characterized in that the first spring end of the spring, to which the pullrod is connected, is unguided, and wherein the pullrod is provided with a joint on a part of the pullrod that is located between the first pullrod end, where the pullrod is connected to the first spring end, and the frame plate. 
     
     
       2. A method for using a spring arrangement comprising the step of:
 charging an opening spring arrangement; 
 charging a closing spring arrangement; 
 the opening spring arrangement and the closing spring arrangement each comprising:
 a rotary shaft; 
 a frame plate having an opening; 
 a spring having a first end and a second end opposite the first end, the second end connected to the frame plate; 
 a pullrod extending through the opening of the frame plate having a first end and a second end opposite the first end, the first end of the pullrod connected to the first end of the spring, and the second end of the pullrod connected the rotary shaft; 
 wherein the second end of the spring is guided by the frame plate and the first end of the spring is unguided. 
 
 
     
     
       3. Spring arrangement according to  claim 1 , characterized in that the joint divides the pullrod in two parts, a first pullrod part connected to a spring disc by the first end of the pullrod, and a second pullrod part connectable to a rotary shaft of a spring drive unit. 
     
     
       4. Spring arrangement according to  claim 1 , characterized in that the joint is located so that an adequate counter torque is created that balances a maximum transversal load resulting from a pullrod deflection angle α cl . 
     
     
       5. Spring arrangement according to  claim 1 , characterized in that the location of the joint is decided such that the weight of the spring is minimized. 
     
     
       6. The spring arrangement of  claim 1 , further comprising a second spring arrangement, wherein the spring arrangement is an opening spring arrangement and the second spring arrangement is a closing spring arrangement comprising a spring, a pullrod and a frame plate. 
     
     
       7. The method of  claim 2 , further comprising a joint on the pullrod of the opening spring arrangement and a joint on the pullrod of the closing spring arrangement. 
     
     
       8. The method of  claim 7 , wherein the joint divides the pullrod into two parts, a first pullrod part connected to a spring disc by the first end of the pullrod, and a second pullrod part connected to the rotary shaft of the spring drive unit. 
     
     
       9. A spring arrangement for spring drive unit comprising:
 a rotary shaft; 
 a frame plate having an opening; 
 a spring having a first end and a second end opposite said first end, said second end connected to said frame plate; 
 a pullrod extending through said opening of said frame plate having a first end and a second end opposite said first end, said first end of said pullrod connected to said first end of said spring, and said second end of said pullrod connected said rotary shaft; 
 wherein said second end of said spring is guided by said frame plate and said first end of said spring is unguided. 
 
     
     
       10. The spring arrangement according to  claim 9 , further comprising a joint on said pullrod. 
     
     
       11. The spring arrangement according to  claim 10 , wherein said joint divides said pullrod into two parts, a first pullrod part connected to a spring disc by said first end of the pullrod, and a second pullrod part connected to said rotary shaft of said spring drive unit. 
     
     
       12. The spring arrangement according to  claim 10 , wherein said joint is located so that an adequate counter torque is created that balances a maximum transversal load resulting from a pullrod deflection angle α cl . 
     
     
       13. Spring The spring arrangement according to  claim 10 , wherein a location of said joint is determined such that the weight of the spring is minimized. 
     
     
       14. The spring arrangement of  claim 1 , further comprising a second spring arrangement, wherein said spring arrangement is an opening spring arrangement and said second spring arrangement is a closing spring arrangement comprising a spring, a pullrod and a frame plate. 
     
     
       15. The method of  claim 7 , wherein the joint is located so that an adequate counter torque is created that balances a maximum transversal load resulting from a pullrod deflection angle α cl . 
     
     
       16. The method of  claim 7 , wherein a location of the joint is determined such that the weight of the spring is minimized.